Disintegrate asm/system.h for Alpha
[deliverable/linux.git] / arch / alpha / oprofile / common.c
1 /**
2 * @file arch/alpha/oprofile/common.c
3 *
4 * @remark Copyright 2002 OProfile authors
5 * @remark Read the file COPYING
6 *
7 * @author Richard Henderson <rth@twiddle.net>
8 */
9
10 #include <linux/oprofile.h>
11 #include <linux/init.h>
12 #include <linux/smp.h>
13 #include <linux/errno.h>
14 #include <asm/ptrace.h>
15
16 #include "op_impl.h"
17
18 extern struct op_axp_model op_model_ev4 __attribute__((weak));
19 extern struct op_axp_model op_model_ev5 __attribute__((weak));
20 extern struct op_axp_model op_model_pca56 __attribute__((weak));
21 extern struct op_axp_model op_model_ev6 __attribute__((weak));
22 extern struct op_axp_model op_model_ev67 __attribute__((weak));
23
24 static struct op_axp_model *model;
25
26 extern void (*perf_irq)(unsigned long, struct pt_regs *);
27 static void (*save_perf_irq)(unsigned long, struct pt_regs *);
28
29 static struct op_counter_config ctr[20];
30 static struct op_system_config sys;
31 static struct op_register_config reg;
32
33 /* Called from do_entInt to handle the performance monitor interrupt. */
34
35 static void
36 op_handle_interrupt(unsigned long which, struct pt_regs *regs)
37 {
38 model->handle_interrupt(which, regs, ctr);
39
40 /* If the user has selected an interrupt frequency that is
41 not exactly the width of the counter, write a new value
42 into the counter such that it'll overflow after N more
43 events. */
44 if ((reg.need_reset >> which) & 1)
45 model->reset_ctr(&reg, which);
46 }
47
48 static int
49 op_axp_setup(void)
50 {
51 unsigned long i, e;
52
53 /* Install our interrupt handler into the existing hook. */
54 save_perf_irq = perf_irq;
55 perf_irq = op_handle_interrupt;
56
57 /* Compute the mask of enabled counters. */
58 for (i = e = 0; i < model->num_counters; ++i)
59 if (ctr[i].enabled)
60 e |= 1 << i;
61 reg.enable = e;
62
63 /* Pre-compute the values to stuff in the hardware registers. */
64 model->reg_setup(&reg, ctr, &sys);
65
66 /* Configure the registers on all cpus. */
67 (void)smp_call_function(model->cpu_setup, &reg, 1);
68 model->cpu_setup(&reg);
69 return 0;
70 }
71
72 static void
73 op_axp_shutdown(void)
74 {
75 /* Remove our interrupt handler. We may be removing this module. */
76 perf_irq = save_perf_irq;
77 }
78
79 static void
80 op_axp_cpu_start(void *dummy)
81 {
82 wrperfmon(1, reg.enable);
83 }
84
85 static int
86 op_axp_start(void)
87 {
88 (void)smp_call_function(op_axp_cpu_start, NULL, 1);
89 op_axp_cpu_start(NULL);
90 return 0;
91 }
92
93 static inline void
94 op_axp_cpu_stop(void *dummy)
95 {
96 /* Disable performance monitoring for all counters. */
97 wrperfmon(0, -1);
98 }
99
100 static void
101 op_axp_stop(void)
102 {
103 (void)smp_call_function(op_axp_cpu_stop, NULL, 1);
104 op_axp_cpu_stop(NULL);
105 }
106
107 static int
108 op_axp_create_files(struct super_block *sb, struct dentry *root)
109 {
110 int i;
111
112 for (i = 0; i < model->num_counters; ++i) {
113 struct dentry *dir;
114 char buf[4];
115
116 snprintf(buf, sizeof buf, "%d", i);
117 dir = oprofilefs_mkdir(sb, root, buf);
118
119 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
120 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
121 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
122 /* Dummies. */
123 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
124 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
125 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
126 }
127
128 if (model->can_set_proc_mode) {
129 oprofilefs_create_ulong(sb, root, "enable_pal",
130 &sys.enable_pal);
131 oprofilefs_create_ulong(sb, root, "enable_kernel",
132 &sys.enable_kernel);
133 oprofilefs_create_ulong(sb, root, "enable_user",
134 &sys.enable_user);
135 }
136
137 return 0;
138 }
139
140 int __init
141 oprofile_arch_init(struct oprofile_operations *ops)
142 {
143 struct op_axp_model *lmodel = NULL;
144
145 switch (implver()) {
146 case IMPLVER_EV4:
147 lmodel = &op_model_ev4;
148 break;
149 case IMPLVER_EV5:
150 /* 21164PC has a slightly different set of events.
151 Recognize the chip by the presence of the MAX insns. */
152 if (!amask(AMASK_MAX))
153 lmodel = &op_model_pca56;
154 else
155 lmodel = &op_model_ev5;
156 break;
157 case IMPLVER_EV6:
158 /* 21264A supports ProfileMe.
159 Recognize the chip by the presence of the CIX insns. */
160 if (!amask(AMASK_CIX))
161 lmodel = &op_model_ev67;
162 else
163 lmodel = &op_model_ev6;
164 break;
165 }
166
167 if (!lmodel)
168 return -ENODEV;
169 model = lmodel;
170
171 ops->create_files = op_axp_create_files;
172 ops->setup = op_axp_setup;
173 ops->shutdown = op_axp_shutdown;
174 ops->start = op_axp_start;
175 ops->stop = op_axp_stop;
176 ops->cpu_type = lmodel->cpu_type;
177
178 printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
179 lmodel->cpu_type);
180
181 return 0;
182 }
183
184
185 void
186 oprofile_arch_exit(void)
187 {
188 }
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